The term "planetary nebula" is a misnomer because they are unrelated to planets or exoplanets. The term originates from the planet-like round shape of these nebulae observed by astronomers through early telescopes.
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The planet must be primarily hydrogen, with presumably an admixture of helium and heavier elements. But why is the planet so large compared with Jupiter? Syllabus BS in Space Science - Free download as PDF File (.pdf), Text File (.txt) or read online for free. Open clusters have been found only in spiral and irregular galaxies, in which active star formation is occurring. Zeilik, Michael A.; Gregory, Stephan A. (1998). Introductory Astronomy & Astrophysics (4th ed.). Saunders College Publishing. ISBN 0-03-006228-4.. Astronomical spectroscopy is the study of astronomy using the techniques of spectroscopy to measure the spectrum of electromagnetic radiation, including visible light and radio, which radiates from stars and other celestial objects. Zeilik, Michael A.; Gregory, Stephan A. (1998), Introductory Astronomy & Astrophysics (4th ed.), Saunders College Publishing, ISBN 0-03-006228-4 かつて、惑星は現在見られる位置の近傍で作られたと考えられていた。しかし、20世紀終わりから21世紀初めにかけて、この考え方は劇的に変わりつつある。現在では、今の太陽系の姿は形成当時とかなり異なっていると信じられている。例えば、内部太陽系に少なくとも水星程度の大きさの天体がいくつかあり…
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Indeed, there is mixed use of “Halley's Comet” and “Halley's comet.” But when it comes to deciding what is most-proper, encyclopedic practices, one must look towards the quality of the sources.
